Handle aliased symbols in namespaces in api check

[sobolk]

Problem

Sometimes the same symbol name appears under different namespaces.
When this happen API Extractor aliases the type with _<number> suffix to de-duplicate it and presents the type as exported with alias.

This became visible after #1917 got merged.

For example (see https://github.com/aws-amplify/amplify-backend/blob/main/packages/client-config/API.md).

// @public
type AmazonCognitoStandardAttributes = 'address' | 'birthdate' | 'email' | 'family_name' | 'gender' | 'given_name' | 'locale' | 'middle_name' | 'name' | 'nickname' | 'phone_number' | 'picture' | 'preferred_username' | 'profile' | 'sub' | 'updated_at' | 'website' | 'zoneinfo';

// @public
type AmazonCognitoStandardAttributes_2 = 'address' | 'birthdate' | 'email' | 'family_name' | 'gender' | 'given_name' | 'locale' | 'middle_name' | 'name' | 'nickname' | 'phone_number' | 'picture' | 'preferred_username' | 'profile' | 'sub' | 'updated_at' | 'website' | 'zoneinfo';

...

declare namespace clientConfigTypesV1_1 {
    export {
        AmazonCognitoStandardAttributes,

...


declare namespace clientConfigTypesV1 {
    export {
        AmazonCognitoStandardAttributes_2 as AmazonCognitoStandardAttributes,

This has led to the following error:

    Error: Validation of @aws-amplify/client-config failed, compiler output:
    index.ts(6,10): error TS2305: Module '"@aws-amplify/client-config"' has no exported member 'AmazonCognitoStandardAttributes_2'.
    index.ts(7,10): error TS2305: Module '"@aws-amplify/client-config"' has no exported member 'AmazonPinpointChannels_2'.
    index.ts(10,10): error TS2305: Module '"@aws-amplify/client-config"' has no exported member 'AwsAppsyncAuthorizationType_2'.
    index.ts(11,10): error TS2305: Module '"@aws-amplify/client-config"' has no exported member 'AwsRegion_2'.
        at ApiChangesValidator.validate (/home/runner/work/amplify-backend/amplify-backend/scripts/components/api-changes-validator/api_changes_validator.ts:61:13)
        at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
        at <anonymous> (/home/runner/work/amplify-backend/amplify-backend/scripts/check_api_changes.ts:70:5)
        at async Promise.allSettled (index 10)
        at <anonymous> (/home/runner/work/amplify-backend/amplify-backend/scripts/check_api_changes.ts:50:27)

Changes

This PR adds logic to handle the case where type exported from namespace might be aliased.

Validation

Added content to test project. (so that npm run test:scripts covers it).
This PRs checks.

Checklist

• If this PR includes a functional change to the runtime behavior of the code, I have added or updated automated test coverage for this change.
• If this PR requires a change to the Project Architecture README, I have included that update in this PR.
• If this PR requires a docs update, I have linked to that docs PR above.
• If this PR modifies E2E tests, makes changes to resource provisioning, or makes SDK calls, I have run the PR checks with the run-e2e label set.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[changeset-bot]

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[Amplifiyer]

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